Removable molding-flask bar.



D. M. FAHNESTOCKQ REMOVABLE MOLDING FLASK BAR.

APPLICATION FILED NOV. 7, I913.

Patented May 4, 1915.

FIG.1

FIG 2 FIG.3

Q INVENTO R\ WWW THF NORRIS PETERS C0,. FHOTO-LITHO., WASHINGTON. D. C.

DAVID M. FAHNESTOGK, OF PITTSBURGH, PENNSYLVANIA.

' REMOVABLE MOLDING-FLASK BAR.

Specification of Letters Patent.

Patented May a, 1915.

Application filed November 7, 1913. Serial No. 799,680.

To all whom it may concern Be it known that 1, DAVID M. FAHNns'rooK, aresident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in RemovableMolding-Flask Bars, of which the following is a specification.

This invention relates to sand-molding flasks, and more particularly tobars for bridging or anchoring the sand in the cope of the flask to moresecurely hold the sand during the operations of molding and handling thecope.

It has been the practice in foundries to place in the copes ofmoldingflasks wooden or iron bars for the purpose of anchoring and holding thesand therein during molding and handling. The disadvantages of thewooden bars are. that they rapidly char and become useless from theheat, and being nailed in place, are not readily removable, or movablefrom one position to another. When it becomes necessary to remove suchbars, or change their positions, the flask walls necessarily becomeweakened by the withdrawal of nails and the repeated driving andremoving of nails soon renders the flask worthless. Moreover, theservices of a carpenter are necessary to carry out these operations.Further, in order to prevent such wooden bars from becoming almostimmediately worthless by charring it is necessary to have them spacedrather. far from the mold cavity, thus preventing an effective anchoringof the sand, in the cope. Metal bars have also been used, and these havebeen secured in position byv bolting the same to the side walls of theflask. The bolt holes weaken the side Walls, and to move the bars fromone position to another requires the boring of newholes, which stillfurther weakens the flask, and also requires the services of acarpenter. Furthermore, after such bolted bars have been'in the flaskfor some time the bolts are rusted orburned so firmly into the wood thatthey have to be cut out at a very considerable expenditure of time andalsodanger of damaging the flask walls.

The object of this invention is to provide a bar for usein moldingflasks which will anchor the sand securely in place, which is 'notsubject to destruction by charring, and

which has fastening means such that the bar is readily removable fromthe flask and adjustable in the flask.

In the accompanying drawings Figure 1 is a diagrammatic plan viewshowing the cope of a wooden flask with a number of the improved barsapplied thereto; Fig. 2 is a vertical sectional view through the cope ofa flask showing one of the dividing bars in side elevation; Fig. 3 is atop plan view of one of the bars on an enlarged scale; and Fig.4: is avertical section through a bar showing modified means for anchoring thesand thereto.

The bar 1 is provided with a thin body portion 4 which extends part wayinto the cope, allowing room for patterns of moderate size to be placedin the flask under the bars. The bar is provided with suitable means foranchoring the sand against displacement and in preventing distortion ofthe mold cavities during pouring. Such anchoring means may be of variouskinds, either depressions in or projections on the surface of said bar.Fig. 2 shows for this purpose a series of perforations 6 extendingentirely through the body of the bar, while Fig. 4: shows the barprovided with a series of projections 7, which may be in the form ofribs extending continuously or inter ruptedly from end to end of the baror for any desired portion of thelength of the bar.

Preferably, the bar is also provided at its lower edge with anenlargement 5, preferably beveled, which serves asan additional anchorfor the sand as well as to strengthen the bar.

The means for securing the bar to the flaskare shown as follows: Theupper edge of the bar at each end is provided with an extension 8adapted to extend over the top edge of the flask wall, and outside ofthe same is provided with a downward projection9 forming a sort of hooktaking over the top edge of the flask. is preferably spread or widenedout, as illustrated, and is provided with an opening 10 adapted to havea wedge 11 driven therethrough and between the outer depending portion 9of the bar and the outer face of the flask wall, thereby wedging the barThe extension 8 i wedges 11 are driven into place.

In use thebar is placed in the flaskwith its body projecting down intothe cope and the hooked end portions 8 restingover the top edges of thecope sides. If it is then necessary to change the position of the bar,

due to a high pattern with which it would interfere or because it isneeded for use in another flask, it can be readily removed simplydriving out the Wedges and lifting it off. When again placed in positionthe wedges 11 are simply driven into place and securely hold the bar inposition during the packing of the sand around the pattern and thesubsequent handling ofthe flask and pouring of the mold. It is apparentthat the bars can thus be very readily changed from one position toanother and also removed from'the flask.

These bars may be formed of any suitable metal, either, steel, iron,brass, bronze, or any suitable alloy, but for reasons of economy in costand in durability, will be formed either of steel or iron. They also arepreferably formed by casting, although they may be formed by forging, orby pressing or otherwise suitably constructing the same from platemetal. These bars are very durable, are not likely to be injured ordestroyed as are wooden bars by the act of fastening them in or removingthem from the flask, canbe quickly and easily changed from one positionto another by any ordinary laborer, and; the fastening means is such asnot to weaken the flask walls. They. also are not injured by the heat ofthe molten metal, and consequentlv only suflicient sand need be providedbetween the edge of the mold cavity and the bridging bar to prevent thecasting from chilling. Asa result a larger number of bars may be putinto a flask for castings of'the same kindthan ispossible with woodenpartitions, and therefore the sand bars aroused, and since they arereadily removable their position can be easily changed to'allow spacefor patterns of peculiar size. The disadvantages of Wooden bars are alsotrue of the metal bars heretofore in use in so far as concerns theirremoval to accommodate specially shaped patterns, since from thediflicultyof their removal it has not been customary to place them asclosely together as can be done with the improved bar, and therefore ithas not been possible to bridge the sand as'securely in the cope. Theimproved bars, because of the method of fastening employed, also bracethe flask and render it less liable to injury from handling.

Various modifications in the size, form and construction of the bar andthe means for securing it to the flask will readily occur to thoseskilled in the art.

It will be understood that no limitations are to be imposed upon theterms of the claims hereinafter made either by the spe cificillustration in the drawings or the specific description in thespecification.

What I claim is:

1. A metallic flask bar or plate for a molding flask, having-a bodyadapted to project into the flaskand having at the upper edges of itsends portions adapted to project over and beyond the side edges of theflask, and means acting between said projecting portions and the sidesof the flask for securing the bar to the flask.

2. A metallic flask bar or plate for a molding flask, having a bodyportion adapted to project into the flask-and having at its upper edgeat both-ends a portion extending over the side of the flask and providedwith an opening therethrough, and wedges adapted to be driven throughsaid openings andbear against the outer side faces of the flask.

3. A metallic flask bar or plate for a molding flask, having a bodyportion arranged to project into the flask and having at its upper edgeat'an end a portion extending over the side of theiflask and providedwith an opening therethrough, and a wedge adapted to be driven throughsaid opening and bear against the outer side face of the flask, the endedges of the body of said bar adjacent said extending portion beingprovided with projections adapted to engage the inner face of the flask.

4. A'metallic flask bar or plate for a molding flask provided with abody adapted to wardly outside the same, the ends of said body beingprovided with teeth or projections, and securing means engaging theoverhanging edge portions of the bar and the flask walls and, arrangedto-force the latter inwardly against said teeth. I, V

5. A metallic flask bar or plate for a molding flask comprising a bodyadapted to proj ect intothe flask and provided with anchoring means,said body having at its ends portions extending beyond the side edges ofthe flask, said projecting portions being cut away to admit of theinsertion of securing means for securing the bar to the flask.

6. A metallic sand bridging bar for a molding flask, comprising a bodymember adapted 'to extend into the flask and provided at both ends withwedging meansacting between the flash walls and projecting portions ofthe bar for detachably securing the same to the flask walls, said meansact ing inwardly against the outer surfaces of the flask walls andtending to prevent lateral spreading of the walls.

7. A metallic partition or dividing bar or plate for a molding fiask,having a thin body portion arranged to project into the flask, said bodyportion being provided with perforations and an enlargement extendingalong its lower edge for anchoring the sand and having at its upper edgeat both ends projections extending over the side walls of the flask andprovided with openings therethrough, and wedges adapted to be driventhrough said openings and bear against the outer faces of the flask.

8. A metallic flask bar or plate for a molding flask, having a bodyprovided with an enlargement extending along its lower edge,

' said body being adapted to project into the DAVID M. FAHNESTOGK.

Witnesses F. W. WINTER, WILLIAM B. WHARTON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, I). G.

